初一下学期英语牛津英语 U2 main task原文、、、
问题描述：
初一下学期英语牛津英语 U2 main task原文、、、
答
At the moment,it may be difficult to imagine,but many people believe that,by the year 2100,we will be living on the planet Mars.Our own planet,Earth,is becoming more and more crowded and polluted.Hope...